Change user_id column non-nullable (mastodon#6435)

app/models/invite.rb

@@ -4,7 +4,7 @@
 # Table name: invites
 #
 #  id         :integer          not null, primary key
-#  user_id    :integer
+#  user_id    :integer          not null
 #  code       :string           default(""), not null
 #  expires_at :datetime
 #  max_uses   :integer

app/models/web/setting.rb

@@ -7,7 +7,7 @@
 #  data       :json
 #  created_at :datetime         not null
 #  updated_at :datetime         not null
-#  user_id    :integer
+#  user_id    :integer          not null
 #
 
 class Web::Setting < ApplicationRecord

db/migrate/20180206000000_change_user_id_nonnullable.rb

@@ -0,0 +1,6 @@
+class ChangeUserIdNonnullable < ActiveRecord::Migration[5.1]
+  def change
+    change_column_null :invites, :user_id, false
+    change_column_null :web_settings, :user_id, false
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20180204034416) do
+ActiveRecord::Schema.define(version: 20180206000000) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -195,7 +195,7 @@
   end
 
   create_table "invites", force: :cascade do |t|
-    t.bigint "user_id"
+    t.bigint "user_id", null: false
     t.string "code", default: "", null: false
     t.datetime "expires_at"
     t.integer "max_uses"
@@ -516,7 +516,7 @@
     t.json "data"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
-    t.bigint "user_id"
+    t.bigint "user_id", null: false
     t.index ["user_id"], name: "index_web_settings_on_user_id", unique: true
   end